Crab Nebula
Expansion age fits 1054.
How it connects
This clue from nature is a clue for
1054 supernova
This clue from nature explains
Guest star near Tianguan, 1054, visible by day 23 days
One item, everything we know about it, and everything it is connected to.
Words we use: Mystery A question nobody has answered yet. Clue from people Something people wrote down or told long ago: a chronicle, a diary, a story, a carving. Clue from nature Something nature recorded by itself: tree rings, ice, rock layers, or the leftovers of an exploded star. Hunch Our guess that a clue from people and a clue from nature are about the same event. Book or paper Where we read it, so anyone can check our work. Step Something we did, in the order we did it.
Expansion age fits 1054.